JP4822701B2 - Vehicle weight measuring device - Google Patents

Description

  The present invention relates to a vehicle weight measuring apparatus including a weighing platform on which an entire vehicle can be loaded and a load detector disposed below the weighing platform.

  Conventionally, there is a truck scale as a typical vehicle weight measuring device. The truck scale includes a weighing platform that can accommodate the entire vehicle, a plurality of load detectors that support the weighing platform and output a load signal corresponding to the load applied on the weighing platform, and these loads. Based on the output from the detector, an arithmetic processing unit for calculating the weight of the vehicle on the weighing platform is provided.

  The conventional vehicle weight measuring device used for the track scale is manufactured so that the measured value of the object to be weighed can be measured with high accuracy so as to be applied to the transaction certification. In addition, in order to be applied to transaction certification, when the load on the weighing platform changes, the measurement value of the weight measurement value for the load before the change must not continue for more than 1 sec. Meets the specifications of non-automatic scales stipulated by law.

  In order to measure the weight of the vehicle on the track scale, a vehicle such as a truck is placed on the weighing platform and stopped, and a weight measurement value of the vehicle is generated based on the output from each load detector. The value is displayed on the display means. Here, since the load change on the weighing table occurs at an arbitrary timing, the static measurement mode in which the weight measurement value can be continuously generated at intervals of less than 1 sec is used, and the weight measurement value is generated each time. The information is supplied to the display means and updated / displayed. As a result, when the load on the weighing platform changes by more than the minimum scale of the vehicle weight measuring device, the weight measurement value after the change is displayed on the display means before 1 second elapses, and the weight measurement value by the naked eye of the operator or the like is stabilized.・ It is possible to judge instability.

  At this time, the operator visually observes the weight measurement value continuously displayed on the display means, confirms that the weight measurement value is in a stable state, and operates the total weight print key. Then, the weight measurement value generated at the time when the key is operated is determined as a measured value (of the vehicle weight), supplied to a printer, a display means, etc. and output. In some cases, the measurement value is determined by inserting a print card into a card reader provided in a printer or the like instead of the key operation. Note that the measurement means for determining the measurement value by the operator's hand based on the weight measurement value generated in the static mode is referred to as manual measurement means.

  According to such a track scale, among the weight measurement values generated in the static measurement mode, the weight measurement value confirmed by the operator as being in a stable state is determined as the vehicle measurement value. It is possible to accurately determine the weight of the vehicle that is stopped immediately. Therefore, this type of vehicle weight measuring device is particularly suitable for obtaining a transaction proof or measuring the weight of an expensive load.

  For the truck scale configured in this way, the axle weight is measured each time the axle gets on and off the weighing platform, and the measurement result is used to measure the weight of each axle attached to the vehicle and the total weight of the vehicle. A technique for measuring the weight of a moving vehicle is disclosed in Patent Document 1. Patent Documents 2 and 3 also propose methods for measuring the axle weight of a vehicle that is moving on the weighing platform.

  Since all of those described in Patent Documents 1 to 3 are for measuring the weight of a vehicle in a moving state on the weighing platform, the load signal output from the load detector is continuously and vibrationally. It is assumed that it will change. Therefore, a time domain in which the sampling weight value obtained from the load signal is relatively stable is extracted, and the vehicle weight measurement value is automatically generated as accurately as possible based on the sampling weight value generated in the time domain. The method of confirming the measured value is adopted. Note that a measurement mode in which a time region in which the sampling weight value is relatively stable is extracted from the load signal and one weight measurement value is automatically obtained is called a dynamic measurement mode. The means for determining as a measurement value is called automatic measurement means.

  According to the vehicle weight measuring apparatus provided with such an automatic measuring means, a time region in which the sampling weight value is relatively stable is extracted and the weight measurement value is automatically measured. Even when a load signal is output, it is possible to measure the weight of the vehicle with relatively high accuracy. For this reason, this type of vehicle weight measuring device is particularly suitable for vehicle weight measurement in the case where quickness is required rather than strictness, for example, when it is necessary to measure many vehicles loaded with inexpensive loads. .

JP-A-63-81220 JP-A-1-282430 JP-A-6-117909

  However, according to the vehicle weight measuring apparatus having only the manual measuring means, when measuring the weight of the vehicle in a moving state on the weighing table, the weight display fluctuates due to the movement of the vehicle, and the weight on the weighing platform of the axle is changed. Since the staying time in is short, it is very difficult to judge the stability of the weight measurement value, and there is a problem that an accurate measurement value cannot be obtained.

  On the other hand, in a vehicle weight measuring apparatus having only automatic measuring means, even when a sufficiently long load signal in the stable region can be obtained by stopping the vehicle on the weighing platform, the vehicle weight measuring device is predetermined from the stable region. According to the conditions, one weight measurement value is determined as the measurement value, and after the determination, even if the load on the weighing platform changes, the determined value will continue to be displayed on the weight indicator. There is a problem that it is not possible to satisfy the provision of the non-automatic balance of the measurement law that the display value of the measured value must not continue for 1 second or longer. Therefore, the vehicle weight measuring device provided only with the automatic measuring means cannot be applied to transaction certification.

  Also, at actual sites, there may be cases where it is desired to perform weighing that conforms to the transaction certification with high accuracy depending on the contents of the load of the vehicle during a series of weighing operations, or the load is inexpensive and there is a large amount of weighing processing. There are times when you want to finish the measurement in a short time. However, at present, there is a problem in that two vehicle measuring apparatuses having either a static measurement mode or a dynamic measurement mode have to be used according to their respective purposes.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a vehicle weight measuring device capable of measuring in an optimal measurement mode according to each vehicle. It is.

In order to achieve the above object, a vehicle weight measuring device according to the present invention comprises:
In a vehicle weight measuring device including a weighing platform on which the entire vehicle can be loaded, and a load detector disposed below the weighing platform,
When the vehicle weight measuring apparatus is in operation , a stable region is defined for the weight measurement value generated based on the output from the load detector, and the weight measurement is performed by the dynamic measurement mode for generating the weight measurement value in the stable region. and automatic measuring means for determining the value as automatic weighing, during operation of the vehicle weight measurement device, fixed as weighing the weight value measured by the static measurement mode for generating said weight measurement continuously manually Manual measurement means for performing the dynamic measurement mode and the static measurement mode in parallel without manually switching and selecting the automatic measurement means and the manual measurement means , When the stable area of the weight measurement value is within a predetermined time, the automatic measuring means is used. When the stable area of the weight measurement value exceeds the predetermined time, the manual meter is used. By means, it is characterized in that is configured to determine a metric value of each of the entire vehicle or axle (first invention).

In the first invention, the measurement value generated in the dynamic measurement mode is an average value of the number of sampling weight values corresponding to the length of the stable time region determined by detecting a change in the sampling weight value. ( Second invention).

In the first aspect of the present invention, if the manual measurement means is not executed when the vehicle passes over the weighing table even if the execution of the manual measurement means is set, a re-weighing alarm signal is output. ( 3rd invention).

In the first aspect of the invention , it is preferable that an alarm is output when a time region in which the weight measurement value can be generated is equal to or shorter than a predetermined time length when the dynamic measurement mode is performed ( fourth aspect ).

In the first aspect of the invention , it is preferable that the zero point adjustment by the operator based on the weight measurement value in the static measurement mode is enabled even when the implementation of the automatic measurement unit is set (the fifth aspect of the invention). ).

In any one of the first to fifth inventions, it is preferable that a display means is provided for instructing and displaying to the driver whether or not the vehicle is to be stopped on the weighing platform ( sixth invention).

According to the first aspect of the present invention, the manual measurement means excellent in accuracy for manually determining the weight measurement value of the vehicle as the measurement value, and the automatic measurement excellent in quickness for automatically determining the weight measurement value as the measurement value. since a two measuring means and means, mounted vehicles and loaded with expensive cargo, vehicles or the like to obtain the transaction certificate, the vehicle it is necessary to determine the exact measurements, an inexpensive load Even if there are vehicles that require quick measurement rather than accuracy , manual measurement is performed in parallel while the measurement value is confirmed by automatic measurement without switching operation. The measured value can be determined by the above, and the weight measurement of all the vehicles can be carried out with one device.

In addition, when the implementation of the manual measurement means is set, among the weight measurement values continuously generated in the static measurement mode, the weight measurement value that is confirmed to be stable by the operator is determined as the measurement value. Therefore, the vehicle weight can be obtained very precisely. On the other hand, when the implementation of the automatic measurement means is set, the time domain in which the weight measurement value can be generated is automatically extracted by the dynamic measurement mode, and the weight measurement value generated in the time domain is measured. Since it is determined as a value, it is possible to quickly and relatively accurately measure the weight of a moving vehicle. In addition, since both the dynamic measurement mode and the static measurement mode are performed in parallel, the static measurement mode and the manual measurement means, and the dynamic measurement mode and the automatic measurement means are being measured during vehicle weighing. Can also be switched instantly.

According to the second invention, the stable time region is obtained by detecting the change in the sampling weight value at the time of entering the axle. Therefore, the slower the vehicle speed, the longer the stable time region is detected, and the longer the time is. The weighing value is obtained by the many sampling weight values in and the weighing accuracy is improved.

By adopting the configuration of the third invention, it is possible to urge the driver of the vehicle to perform reweighing when manual measurement means cannot be implemented. Further, if the configuration of the fourth invention is adopted, when the dynamic measurement mode is performed, the time region in which the weight measurement value can be generated is equal to or less than a predetermined length, and the weight measurement value can be generated in the dynamic measurement mode. The driver can be made aware that this is not possible, and the driver can be encouraged to reweigh the vehicle at a lower vehicle speed. Thereby, at the time of re-weighing, it can prevent that the said time area becomes below predetermined length again.

By adopting the configuration of the fifth invention, it is possible to prevent a measurement error from occurring.

In addition, if the configuration of the sixth invention is adopted, it is possible to display whether or not the vehicle is stopped on the weighing platform based on the set measuring means so that the driver can recognize it. It is possible to prevent the vehicle from erroneously stopping on the weighing table or, conversely, passing the vehicle on the weighing table without stopping when setting the manual measurement means.

  Next, specific embodiments of a vehicle weight measuring device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view (a) and a side view (b) of a vehicle weight measuring device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram of the vehicle weight measuring device of the present embodiment. Has been. FIG. 3 is an explanatory diagram for explaining a method for acquiring a static measurement value, FIG. 4 is a diagram showing a waveform drawn by a sampling weight value, and FIG. Each figure shows a state in which the automatic measurement mode is executed in parallel.

  The vehicle weight measuring device 1 of the present embodiment is used to measure the total weight of a vehicle 2 that includes three axles 2a, 2b, and 2c that travel from left to right in FIG. Here, the first shaft 2a, the second shaft 2b, and the third shaft 2c are referred to in order from the axle positioned at the front portion of the vehicle 2.

  In the present embodiment, an IC tag (not shown) is installed on the vehicle 2 to be measured, and the IC tag includes a vehicle identification number, cargo type, shipper name, vehicle 2 body weight value, and the like. In addition to the data, command codes (commands for stop measurement and non-stop measurement, respectively) as command means for measuring the weight by stopping the vehicle 2 on the weighing platform 5 or performing the weight measurement without stopping. .)It is included. The stop measurement command / non-stop measurement command is determined depending on whether the value of the load of the vehicle 2 or a transaction certificate needs to be acquired. When the stop measurement command is issued, the measuring means is switched to manual measurement means (described later), and when the non-stop measurement command is issued, it is switched to automatic measurement means (described later). It is configured.

  The vehicle weight measuring device 1 includes a weighing unit 3 and a weight measuring unit 4 (not shown in FIG. 1B). Here, the measuring unit 3 has a size that allows all of the wheels 2a ′, 2a ′; 2b ′, 2b ′; 2c ′, 2c ′ on both ends of the axles 2a, 2b, 2c of the vehicle 2 to ride simultaneously. And a total of four load cells (load detectors) 6a, 6b, 6c, 6d provided at the lower four corners of the weighing table 5. Further, a vehicle that is on the weighing platform 5 at a side position of the weighing platform 5 and slightly on the standby position side of the vehicle 2 (left side in FIGS. 1A and 1B). The IC tag reading device 18 that reads the IC tag 2 is provided with an external display plate 17 (shown only in FIG. 1B, not shown in FIG. 1A) at the front position of the weighing platform 5. It has been.

  Meanwhile, as shown in FIG. 2, the weight measuring unit 4 includes first to fourth amplifiers 7a, 7b, 7c, which amplify weight signals transmitted from the load cells 6a, 6b, 6c, 6d, respectively. 7d and a fifth amplifier (adder circuit) 8 for summing weight signals from the amplifiers 7a to 7d.

  The fifth amplifier 8 is connected to an arithmetic processing unit (CPU) 13 through an analog filter 9, an analog / digital converter (A / D converter) 10, a primary digital filter 11 and an I / O unit 12. Yes.

  The analog weight signal output from the fifth amplifier 8 is supplied to the A / D converter 10 after high frequency noise is removed by the analog filter 9. The A / D converter 10 samples and digitizes an analog weight signal at an extremely short sampling time interval, and the sampling time interval is measured by vibrations from the vehicle 2 included in the weight signal, and measurement. It is set to 1 msec which is sufficiently shorter than the period of the vibration noise signal such as the natural vibration of the table 5. As a result, the A / D converter 10 outputs a time-series digital weight signal having a sampling period Δt = 1 msec, which substantially faithfully reproduces the characteristics of the analog weight signal.

  The time series digital weight signal output from the A / D converter 10 is subjected to removal of the line nozzle and the like contained in the time series digital superposition signal by the primary digital filter 11, and the arithmetic processing unit 13 via the I / O unit 12. To be input. Here, the primary digital filter 11 is a kind of digital filter that performs a moving average calculation by 16 or 20 in time series every time a digital weight signal is supplied. The time-series digital weight signal that is continuously output every 1 msec by the A / D converter 10 and noise is removed by the primary digital filter 11 is referred to as a sampling weight value Ws.

  The arithmetic processing unit 13 is configured to execute various programs in addition to a stable state detection logic for detecting whether or not a static measurement value described later is in a stable state. The arithmetic processing unit 13 is connected to a memory 14 for storing the program and various data, and various key switches (not shown) such as a gross weight printing key to be described later via the I / O unit 12. ) Connected to the input unit 15, the display unit 16 for displaying the calculation processing result (total weight, net weight, etc. of the vehicle 2), the external display board 17, the IC tag reader 18, and a printer (printer) (not shown). Has been.

The arithmetic processing unit 13 includes an axis number counter Cm that counts the number of axes of the vehicle 2 that gets on and off the weighing platform 5 in its calculation area. In the following description, the axle getting on the weighing platform 5 is referred to as axle input, and conversely, the axle getting off from the weighing platform 5 is referred to as axle output. The axis number counter Cm is cleared when the power is turned on or when measuring near the zero point, but when an axle input to the weighing platform 5 is detected, Cm = Cm + 1
In this way, the axis number counter Cm is counted up, and when the axle output from the weighing platform 5 is detected, the axis number counter Cm is counted down as Cm = Cm−1.

  The display unit 16 includes a total weight indicator that displays the total weight of the vehicle 2 on the weighing platform 5 and the net weight of the load obtained by subtracting the tare weight of the vehicle 2 from the total weight. Yes. Various forms are conceivable as the total weight indicator, but it is possible to use a single CRT or liquid crystal display to display each numerical value in a different area of the screen, and each weight may be displayed separately. You may take the structure displayed on this apparatus. The display unit 16 has a function of sequentially updating and displaying weight measurement values (referred to as static measurement values Was) sequentially generated in a static measurement mode (described later) for the total weight of the vehicle 2, and automatic It has a function of displaying a measured value determined based on a weight measurement value (called dynamic measurement value Wad) obtained in a measurement mode (described later). The net weight may be configured to display each value obtained based on the measurement mode, but is obtained by subtracting the total weight of the vehicle 2 from the determined measurement value (total weight of the vehicle 2). The method to display the value to be displayed is adopted.

  The IC tag reader 18 reads vehicle data and command codes from the IC tag of the vehicle 2 that is about to get on the weighing platform 5 and transmits the vehicle data and command code to the arithmetic processing unit 13. The external display board 17 stops the vehicle 2 on the weighing platform 5 according to the content of the command code (stop measurement command, non-stop measurement command) read by the IC tag reader 18, or It displays whether the weighing platform 5 is allowed to pass without stopping and serves to make the driver of the vehicle 2 recognize.

  The input unit 15 is provided with various keys such as a total weight printing key. This total weight printing key is a key that is operated by an operator when a stop measurement command is registered in the command code, that is, when the weight of the vehicle 2 is measured by the manual measuring means, When the static measurement value Was generated in the measurement mode (described later in detail) is in a stable state, this is a key for determining the stable value as the measured value of the vehicle 2. In addition, there is an example of manual measurement in which the measurement value is fixed by inserting a print card into a card reader provided in the printer instead of the key operation.

  Further, the total weight, net weight, etc. of the vehicle 2 obtained by the manual measuring means or the automatic measuring means are printed on the transaction slip by the printer.

  In the present embodiment, the vehicle weight measuring device 1 has two types of measurement modes, a dynamic measurement mode and a static measurement mode, and a dynamic measurement value Wad generated by the dynamic measurement mode is a measured value. There are two types of measuring means: an automatic measuring means for determining as a measurement value, and a manual measuring means for determining a static measurement value Was generated in the static measurement mode as a measurement value.

  Here, the dynamic measurement mode is a measurement mode in which the weight measurement value of the vehicle 2 that is in a moving state on the weighing platform 5 is generated relatively quickly, and the sampling weight value Ws generated in time series. From the degree of fluctuation, a stable time region (regions indicated by reference signs A1 to A4 in FIG. 4) in which the sampling weight value Ws is relatively stable is automatically extracted, and the sampling weight generated in the stable time region. This is a measurement mode in which an average value of the values Ws is generated as one dynamic measurement value Wad. In addition, the automatic measurement means means that a single dynamic measurement value Wad generated in the dynamic measurement mode is sent to a printer, left as a measurement record, and the dynamic measurement value Wad is measured (vehicle). This means a measuring means that is determined as the measured value of 2).

  According to the dynamic measurement mode and the automatic measurement means, a comparatively stable stable time region is automatically extracted from the fluctuation of the sampling weight value Ws, and the average value of the sampling weight values Ws generated within the stable time region. Since the vehicle 2 is in a moving state and the fluctuating sampling weight value Ws is obtained, the weight of the vehicle 2 is measured with relatively high accuracy. There is an advantage that you can. In addition, since there is no need to stop the vehicle 2, there is an advantage that the weight measurement of the vehicle 2 is completed quickly. Therefore, the dynamic measurement mode and the automatic measurement means are particularly suitable for weight measurement that requires quickness rather than strictness, for example, when measuring a vehicle 2 carrying an inexpensive load.

  On the other hand, the static measurement mode is a measurement mode for strictly measuring the weight of the vehicle 2 on the weighing platform 5, unlike the dynamic measurement mode, and as shown in FIG. 3, the required time interval Tsmsec. The average value Wa of the required number (in this case, Ts) of the sampling weight values Ws is obtained every (<1 sec), and the average value Wa is generated as the static measurement value Was, and the static measurement value Was is generated. This is a measurement mode that is supplied to the total weight display of the display unit 16 and displayed. According to this static measurement mode, the static measurement value Was is continuously generated at intervals of less than 1 sec and displayed on the total weight display. Therefore, “the display value of the weight measurement value continues for 1 sec or more. It meets the provisions of non-automatic weighing instruments under the Measurement Law. The manual measurement means means that an operator or the like confirms that the static measurement value Was continuously displayed on the total weight display is stable, and operates the key operation of the total weight print key or the print card. It is a measuring means for determining, as a measured value, a static measurement value Was generated when a key is operated or when a print card is inserted when inserted into a card reader of the printer.

  According to the static measurement mode and the manual measurement means, the operator confirms that the continuously displayed static measurement value Was is stable, and performs a key operation or a print card insertion operation. Since the static measurement value Was at the time of the insertion operation of the printing card is determined as the measurement value, the weight measurement of the vehicle 2 in a stationary state on the measurement table 5 can be performed very strictly. Therefore, the static mode and the manual measurement means are particularly suitable for use in cases where it is necessary to perform strict weight measurement, such as a vehicle 2 loaded with an expensive load or a vehicle 2 that requires acquisition of a transaction certificate. Yes.

  The weight measuring unit 4 is configured to automatically switch between the automatic measuring unit and the manual measuring unit based on the command code of the IC tag, and by manual operation by an operator or the like (for example, key operation of the input unit 15). A function for switching the measuring means is provided. Thereby, the weight measurement of the vehicle 2 can be implemented by an optimum measuring means corresponding to the state of each vehicle 2 or the like.

  In the present embodiment, the static measurement mode and the dynamic measurement mode are executed in parallel regardless of which measurement means is designated. As a result, there is a situation where the manual measurement means is set to be implemented and the measurement value cannot be fixed by the manual measurement means (such as when the vehicle 2 passes through the weighing platform 5 without stopping). Even so, the automatic measurement means using the dynamic measurement mode can be implemented instead, and the dynamic measurement value Wad can be determined as the measurement value.

  Next, a measurement method and a weight display method for the vehicle 2 having the three axles 2a to 2c will be described.

  In the present embodiment, after the vehicle weight measuring apparatus 1 is turned on, the weight measuring unit 4 is in a static measurement mode, and the total weight indicator of the display unit 16 is generated statically every Tsmsec. The measured value Was is displayed continuously.

  Further, in the present embodiment, when the vehicle weight measuring device 1 is activated and when an error occurs in the measured value due to adhesion of mud or the like on the weighing table 5 or movement of the zero point of each load cell 4a to 4d, Error correction is performed by adjusting the zero point. Hereinafter, the zero point adjustment will be described.

After turning on the power of the vehicle weight measuring device 1, the total average weight value of the weighing table 5 obtained in the static measurement mode, the objects placed on the weighing table 5 and the attached matter is W _mean, and the initial load of the weighing table 5 etc. Is Wi, and the stored value (initial value = 0) of the zero point movement amount during use is Wz, the static measurement value Was by static measurement is
Was = W _mean −Wi−Wz
It is expressed. At this time, if zero adjustment is performed by the operator, the value of W _mean −Wi is set as the stored value Wz. Thereby, the static measurement value Was after power-on is adjusted to zero.

  As the weight of the vehicle 2 is measured, the zero point of each of the load cells 4a to 4d moves or mud adheres to the weighing table 5, and the average weight value Wa changes. Even if there is not, a static measurement value Was other than 0 is generated. In this case as well, the weight measurement value is adjusted to 0 in the same manner as described above to prevent an error from occurring in the weight measurement result of the vehicle 2. Measurement of the vehicle 2 is started in such a state that the static measurement value Was is adjusted to zero.

  When the vehicle 2 loads a load, approaches the weighing platform 5 and passes in front of the IC tag reader 18, the vehicle identification number unique to the vehicle 2, the type of load, the name of the shipper, the weight value of the vehicle 2, etc. In addition to the vehicle data representing, a command code (stop measurement command or non-stop measurement command) is read, and the dynamic measurement mode is implemented in parallel with the static measurement mode.

  The weight measuring unit 4 determines whether the command code registered in the IC tag is a stop measurement command or a non-stop measurement command, and the command (stop) on the side registered in the external display board 17 is determined. Measurement command or non-stop measurement command) is displayed together with the vehicle identification number, the supplier number, and the like.

  When a stop measurement command is registered in the command code, the driver of the vehicle 2 completely gets the vehicle 2 on the weighing platform 5 and stops it. In addition, when the stop measurement command is registered, the key operation of the gross weight print key or the insertion operation of the print card becomes valid, and the measurement value is obtained from the static measurement value Was generated in the static measurement mode. It is possible to implement manual measurement means for confirmation.

  In the static measurement mode, as shown in FIG. 3, the average value Wa of the sampling weight values Ws generated at the sampling period Δt (= 1 msec) interval is obtained every predetermined time interval Tsmsec (<1 sec). The static measurement value Was is generated. The static measurement value Was is updated and displayed on the total weight indicator of the display unit 16 every time it is generated. In the present embodiment, since Tsmsec <1 sec as described above, when the load on the weighing table 5 is changed, the interval is less than 1 sec that satisfies the non-automatic weighing rule of the metrology law. Thus, the static measurement value Was changing continuously is updated and displayed on the total weight display.

  The operator visually confirms the weight value displayed on the total weight indicator, and if it is determined that the weight value is stable and stable, the key operation of the total weight print key or the print card insertion operation is performed. I do.

  At this time, the stable state detection logic is executed in the arithmetic processing unit 13 of the weight measuring unit 4. Here, the stable state detection logic refers to a logic program that detects whether or not the static measurement value is in a stable state. For example, the static measurement value Was output every Tsmsec is the latest value. Always store and compare three items in the old direction from the oldest, and if all three static measurement values Was are within ± 1st of the minimum display amount based on the latest static measurement value Was, the latest A logic program that determines that the static measurement value Was is in a stable state.

  If it is determined by the stable state detection logic that the static measurement value Was is stable, the static measurement value Was at the time of key operation or printing card insertion operation is determined as the measurement value. In addition, the net weight of the load is calculated based on the measured value and the total weight of the vehicle 2 main body registered in the IC tag. The total weight of the vehicle 2 and the net weight of the load are supplied to the printer and printed as print data representing the load amount of the vehicle 2 and are stored in the memory 14 for leaving a weighing record. Further, when the stability determination of the stable state detection logic is not satisfied during the key operation or the printing card insertion operation, the process waits until the stability determination is satisfied, and the static measurement value Was when the stability determination is satisfied. Is determined as the weighing value.

  In the present embodiment, the static measurement mode and the dynamic measurement mode are performed regardless of the command code of the IC tag. Therefore, even when the static measurement mode and the manual measurement means are performed, the dynamic measurement mode is used. Are generated in parallel and temporarily stored in the memory 14 of the weight display unit 4 (see FIG. 5). Therefore, even if it is a case where stop measurement is instructed and the vehicle 2 passes the weighing platform 5 and the manual measurement means cannot be implemented, the automatic measurement means uses the dynamic measurement value Wad. Can be determined as the measured value, and the net weight of the vehicle 2 can be calculated from the measured value.

  On the other hand, when a non-stop command is registered in the IC tag, the vehicle 2 is moved forward and passed over the weighing platform 5 without being stopped. In this case, the key operation of the total weight print key and the print card insertion operation are invalid, and the weight of the vehicle 2 is measured in the dynamic measurement mode and the automatic measurement means. Even when the automatic measurement means is implemented, the static measurement mode is performed in parallel, so that accurate zero adjustment can be performed.

  Hereinafter, the determination method of the measurement value by the dynamic measurement mode and the automatic measurement means will be described in detail.

When the vehicle 2 is advanced and it is determined that the non-stop measurement command is registered in the command code of the IC tag, the load on the weighing platform 5 is near the zero point, that is, nothing on the weighing platform 5 In order to confirm that it is not placed, the upper limit weight value Wzu set in advance in the weight measuring unit 4 and the static measurement value Was are Was <Wzu
It is confirmed whether or not the condition is satisfied (see region X1 in FIG. 4).

  If the previous equation is satisfied, it is determined that the weight measurement value (static measurement value) Was is near zero and nothing is placed on the weighing platform 5, and the weight measurement by the automatic measurement means of the vehicle 2 is performed. Will continue. Further, the sampling weight value Ws generated when the previous expression is established is stored in the maximum value register wmax. On the other hand, in the minimum value register wmin, the value of the lower limit weight value −Wzu set in the weight measuring unit 4 in advance is entered and fixed without updating.

Each time the sampling weight value Ws is newly generated, the sampling weight value Ws is compared with the maximum value wmax. When the generated sampling weight value Ws exceeds the maximum value wmax, it is updated and stored as a new maximum value wmax. Each time wmax is updated to a new value, the following formula (1)
| Wmax−wmin |> Wh (1)
Check whether or not is true.

  When the expression (1) is satisfied, it is determined that the input of the single shaft 2a is received at the time when the expression (1) is satisfied (t = t1), and the axle counter Cm (in this case 0) is counted up (Cm = Cm + 1). Note that the equation (1) is updated when the maximum value register wmax is updated when the axle is input, and when the minimum value register wmin is updated when the axle is output.

  Here, Wh is a boundary setting value for detecting axle input or axle output, and is set to a value slightly smaller than the lightest axle weight of the vehicle 2. This is because if Wh is set too large, axle input / output may not be detected when the axle (especially the lightest axle) gets on and off, and if it is set too low, it is not during axle input / output. This is because the axle input / output may be erroneously detected due to the relatively large vibration of the sampling weight value Ws generated in the above.

After the input of the one axis 2a (after the establishment of the expression (1)), every time the sampling weight value Ws is newly generated, the sampling weight value w (t <k) at the generation time point (t = t <k>). >) And the magnitude relationship between the sampling weight value w (t <k + 1>) at the next generation time point (t = t <k + 1>). At the time of axle input, since the sampling weight value Ws is a simple increase,
w (t <k>)> w (<k + 1>)
When t = t <k> is established, the maximum value w (t <k>) of the sampling weight value Ws for the first time after t = t1 is obtained.

  Similarly, every time the sampling weight value Ws is generated after the time t = t <k> at which the maximum value w (t <k>) is obtained, the sampling weight at the generation time point (t = t <p>). The magnitude relationship between the value w (t <p>) and the sampling weight value w (t <p + 1>) at the next generation time (t = t <p + 1>) is examined.

Since the sampling weight value Ws is naturally simply reduced after the maximum value w (t = t <k>),
w (t <p>) <w (t <p + 1>)
When t = t <p> is established, the first minimum value w (t <p>) of the sampling weight value Ws after t = t1 is obtained.

  Then, the time point (t = t <p>) at which the second extreme value (in this case, the minimum value of the first sampling weight value Ws) is recognized after the axle input is set as the start point of the stable time region. By doing so, it is possible to avoid a transient and large fluctuation (see region X2 in FIG. 4) of the sampling weight value Ws appearing immediately after the axle input (output) is included in the stable time region. It is possible to prevent a large error from occurring in the dynamic measurement value Wad.

  In the present embodiment, the time point (t = t <p>) at which the minimum value of the sampling weight value Ws is first acquired after satisfying the expression (1) is set as the start point of the stable time region. If the transitional fluctuation after the input can be avoided, the starting point of the stable time region can be determined by another method. For example, as shown in the figure, the timer T0 may be actuated from the time (t = t <k>) when the first extreme value is acquired after the axle is input (a certain number of sampling frequencies may be counted). The end point of the timer T0 may be the start point of the stable time region, or the timer T0 ′ may be operated from the time of axle input (t = t1), and the end point of the timer T0 ′ may be the start point of the stable time region.

When the start end of the stable time region is determined, the maximum value register wmax and the minimum value register wminx are once cleared, and the sampling weight value Ws generated at the start end of the stable time region is stored in the maximum value register wmax and the minimum value register wmin. Remembered. Then, each time the sampling weight value Ws is newly generated, the sampling weight value Ws is compared with the maximum value wmax, and when the generated sampling weight value Ws exceeds the maximum value wmax, a new maximum value is obtained. Each time wmax is updated / stored as a new value and wmax is updated to a new value, the following formula (1)
| Wmax−wmin |> Wh (1)
Check whether or not is true. As described above, the second establishment time of the expression (1), that is, the input time of the biaxial 2b is searched.

  On the other hand, the end of the stable time region is determined as follows. First, the timer Tm is activated from the time point (t = <p>) determined as the beginning of the stable time region. Actually, since the sampling weight value Ws is generated at an interval of 1 msec, if the operation time of the timer Tm is set to Tsmsec, Ts sampling weight values Ws generated after t = <p>. Should be counted. All the Ts sampling weight values Ws generated during the operation of the timer Tm are stored in the sampling weight value storage register in the memory 14 in time series. When the time-up of the timer Tm is established prior to the establishment of the expression (1) as in the case of the input of the single axis 2a (see the area X3 in FIG. 4), the timer-up time (t = T1e), the end of the stable time region is determined. Here, the operation time of the timer Tm is sufficient to obtain the average value of the sampling weight value Ws, or when the weight measurement value is obtained by performing various filter processing operations, the weight measurement value with high accuracy is obtained. Is set to a length sufficient to determine That is, the timer Tm is a timer for designating the longest stable region in dynamic measurement.

  In actual weight measurement, there is a case where the weight signal has already started a simple increase due to the next axle entering immediately before the timer Tm expires, so the data at the time when the timer Tm expires is established. Going back to the old data, the data at a certain point in the sampling weight value storage register is compared with the previous data in order, and the point where the magnitude relationship is reversed, that is, the extreme value of the sampling weight value Ws is checked, and the timer is up. The time point at which the sampling weight value Ws finally becomes the minimum value is specified before, and this time point is set as the end of the stable time region. Specifically, if the data at the time when the timer up is established is larger than the immediately preceding data, the time when the sampling weight value Ws finally reaches the extreme value (in this case, the minimal value) before the timer up is established. The end of the stable time region. On the other hand, if the data at the time when the timer is up is smaller than the previous data, the last extreme before the timer is up is the maximum, so the extreme ( The time when the minimum value is reached is the end of the stable time region (see region X3 in FIG. 4).

  Thus, when the start and end of the stable time region are determined, that is, when the stable time region is automatically extracted, an average value of the sampling weight values Ws generated in the stable time region is obtained. Becomes the weight measurement value (dynamic measurement value) Wad of the single shaft 2a. The dynamic measurement value Wad of the one axis 2a thus obtained is temporarily stored in the memory 14 of the weight measuring unit 4 together with the value of the counter Cm (= 1).

  When the vehicle 2 moves forward and the equation (1) is established again, it is determined that the two shafts 2b of the vehicle 2 have been input onto the weighing platform 5, and the axle counter is the same as when the one shaft 2a is input. Cm (= 1) is counted up by 1 (Cm (= 2) = Cm + 1), and the start of the stable time region (the time when the first minimum value is established after the end of equation (1) (t = t <p>) ) Is determined, and the timer count of the timer Tm is started from the beginning of the stable time region (see region X4 in FIG. 4).

  In addition, the maximum value / minimum value registers wmax and wmin are cleared, and the sampling weight value Ws at the beginning of the stable time region (t = t <p> after the input of the two axes 2b) is the maximum value / minimum value. Newly input to the registers wmax and wmin, and in the same manner as described above, the establishment of the third expression (1), that is, the input of the three axes 2c is checked.

  Here, as shown in FIGS. 1A and 1B, the vehicle 2 has a configuration in which the distance between the two axes 2b and the two axes 2c is narrower than that between the first and second axes 2a and 2b. Before the timer Tm is up, the above equation (1) is established (that is, the three axes 2a are input to the weighing platform 5), and the sampling weight value Ws is simply increased (region X5 in the figure). reference.). Further, even when the distance between the axles is relatively long, when the vehicle 2 moves at a high speed and the subsequent axle immediately enters the vehicle, the equation (1) is established before the timer Tm is up.

  In such a case, if the start and end of the stable time region are determined and the average of the sampling weight values Ws is obtained in the same manner as when the one axis 2a is input, a measurement result greatly different from the actual weight value is obtained. become.

  Therefore, when the equation (1) is established before the timer Tm is up, the end of the stable time region is determined as follows.

  At the end of the timer Tm, when the equation (1) is established first and the sampling weight value Ws starts to increase simply, from the time when the third equation (1) is established, the old data is moved toward the old data. The point-in-time comparison of the sampling weight value register and the immediately preceding data are sequentially performed, and the point at which the magnitude relationship is reversed, that is, the sampling weight value Ws is finally the extreme value (axle before the expression (1) is satisfied). When the weight measurement is based on the input, the minimum value is obtained. When the weight measurement is performed based on the axle output, the maximum value is examined.

  By determining the end point in this way, it is possible to avoid the sampling weight value Ws that simply increases from being included in the stable time region, and to prevent a large error from occurring in the dynamic measurement value Wad. Can do. The timer Tm is reset when the timer Tm expires or when the following axle is input / output even before the timer expires.

  When the start and end of the stable time region are determined and a sufficient number of sampling weight values Ws are generated in the stable time region, the sampling weight value Ws in the stable time region is dynamically measured. The dynamic measurement value Wad according to the mode is used. Thereby, the total weight value (dynamic measurement value Wad) of the axles (the first shaft 2a and the second shaft 2b) placed on the weighing platform 5 is obtained. This total weight value (dynamic measurement value Wad) is also temporarily stored in the memory 14 of the weight measurement unit 4 together with the value of the axis number counter Cm (= 2), similarly to the dynamic measurement value of the single axis 2a. Updated.

  On the other hand, if the sampling weight value Ws in the stable time region is smaller than the predetermined number, the accuracy of the dynamic measurement value Wad cannot be guaranteed. The driver of the vehicle 2 is prompted to measure the weight again at a lower speed.

Next, when the third axis 2c is input and the third expression (1) is established, the axis number counter Cm is counted up to 3, and the stable time region is the same as when the first axis 2a or the second axis 2b is input. Is determined, the total weight value (dynamic measurement value) Wad of the 1 axis 2a to 3 axes 2c is obtained, and is temporarily stored in the memory 14 together with the value of the axis number counter Cm (= 3). (See region X6 in FIG. 4).

  When the vehicle 2 is further advanced, the fourth expression (1) is confirmed. However, in this case, unlike the case of inputting the 1st axis 2a to the 3rd axis 2c, the expression (1) is established when the sampling weight value Ws is simply decreased (see FIG. 4, refer to region Y.), it is determined that there is an axle output of (1 axis 2a) instead of an axle input, and the axis number counter Cm (= 3) counts down by 1 (Cm (= 2) = Cm-1). With this as an opportunity, it is determined that the number of axes of the vehicle 2 being measured is “3”, and the dynamic measurement value Wad (1 axis 2a to 3 axis 2c) stored when the axis number counter Cm is 3. Is a dynamic measurement value Wad representing the total weight of the vehicle 2.

  When the total weight (dynamic measurement value Wad) of the vehicle 2 is obtained, the net weight (load weight) of the vehicle 2 is calculated based on the total weight and the weight of the vehicle 2 main body registered in the IC tag. . The total weight (dynamic measurement value Wad) and the net weight are supplied to the display unit and the printer and output, and are stored in the memory 14 as temporary storage data. Thereby, the dynamic measurement value Wad indicating the total weight of the vehicle 2 is determined as the measurement value.

  The measurement value may be determined when the axle output is detected for the first time, or when the axle number counter Cm becomes zero (when the vehicle 2 is completely removed from the weighing platform 5). You can go. Alternatively, the number of axles of the vehicle 2 may be registered in the IC tag, and the registration may be performed at the timing when the number of registered axles is equal to the value of the axle counter Cm.

  Further, the static measurement value Was generated in the static measurement mode is supplied to and displayed on the weight display for manual measurement every time it is generated regardless of the stop / non-stop measurement command.

  Then, after all the axles 2a to 2c of the vehicle 2 descend from the weighing platform 5 and the value of the axis number counter Cm becomes 0, the static measurement value Was satisfies Was <Wzu as described above. Whether the following vehicle is being weighed.

  The vehicle weight measuring device 1 of the present embodiment includes two measuring means, that is, an automatic measuring means that uses a dynamic measurement mode and a manual measuring means that uses a static measurement mode. In accordance with a stop measurement command and a non-stop measurement command), the measurement means can be switched as appropriate. Therefore, the weight measurement of a vehicle (such as a vehicle that obtains a transaction proof) that requires a strict measurement result and the weight measurement of a vehicle (such as a vehicle 2 that is loaded with an inexpensive load) that requires rapid measurement are performed. It can be implemented with a single device. Therefore, it is not necessary to use two measurement apparatuses having a measurement mode of either the static measurement mode or the dynamic measurement mode as in the prior art, and the cost and space are excellent.

  Further, since the IC tag in which the command code is registered is a wireless system, even if the vehicle 2 is in a moving state, the weight measuring unit 4 is automatically instructed which measurement means to implement. Can do. Therefore, it is not necessary for the operator to bother to set which weighing means to use when starting measurement of each vehicle, and the weight of the vehicle 2 can be measured without delay. Further, even when a wireless transmission unit using electromagnetic waves or light as an information transmission medium is used in place of the IC tag, the same effect can be obtained.

  Needless to say, the weight measuring unit 4 is appropriately provided with a switching key, and the operator operates the switching key according to the value of the load on the vehicle 2 to switch between the manual measuring means and the automatic measuring means. It is.

  In addition, in the present embodiment, since the measurement mode of the static measurement mode and the dynamic measurement mode are always performed in parallel (see FIG. 5), always the dynamic measurement value Wad, Static measurement values Was are generated in parallel. Therefore, for example, even when the vehicle 2 passes without stopping on the weighing platform 5 when the manual measurement means is commanded and the measurement value cannot be determined by the manual measurement means, the measurement value is obtained by the automatic measurement means. It can be obtained. Furthermore, since the static measurement value Was is generated every time Tsmsec even when the dynamic measurement means is instructed, the above-described zero adjustment can be performed without switching to the manual measurement means.

  In the present embodiment, an example has been described in which the total weight (dynamic measurement value) of one axle 2a or each axle is obtained in the dynamic measurement mode based on the dynamic measurement value Wad obtained when the axle is input. It can also be obtained at the time of axle output. In order to do this, every time an axle output is detected (that is, whenever equation (1) holds when the sampling weight value Ws is simply reduced), the stable time region is extracted in the same manner as when the axle is input. (Refer to region Y in FIG. 4.) Then, the dynamic measurement value Wad may be obtained. However, at the time of axle output, contrary to when the axle is input, the above equation (1) is established with the sampling weight value Ws being simply reduced. The point in time when the sampling weight value Ws reaches the maximum is determined as the start point of the stable time region. Further, before the end time of the timer Tm started from the beginning of the stable time region, the time when the sampling weight value Ws finally reaches a maximum (timer up of the timer Tm is prior to the establishment of the following expression (1)) Or when the sampling weight value Ws finally reaches a maximum before the next expression (1) is satisfied (when the next expression (1) is satisfied before the timer Tm). It is the end of the stable time region.

  In the present embodiment, the dynamic measurement mode and the static measurement mode are performed in parallel, and when manual measurement cannot be performed at the time of a manual measurement means command, the dynamic measurement mode and the static measurement mode are generated in the dynamic measurement mode. The measurement value is determined by the automatic measurement means using the dynamic measurement value Wad, but a permission mode for permitting the implementation of the automatic measurement means and a prohibition mode for prohibition are provided respectively. It is also possible to adopt a configuration that employs one of the modes when commanding. Hereinafter, the weight measurement of the vehicle 2 by the weight measuring device 1 having the permission mode / prohibition mode will be described.

  When the stop measurement command is registered in the IC tag of the vehicle 2, the entire vehicle 2 is on the weighing table 5, and when the operator operates the gross weight print key or inserts the print card, The stability determination of the static measurement value Was is performed, and the static measurement value Was determined to be stable is determined as the measurement value.

  Thus, when the total weight print key is operated or the print card is inserted and the manual measurement means is completed, the manual measurement completion flag provided in the weight measuring unit 4 is changed from the initial value “0”. , "1" is set.

  When the axle counter Cm ≠ 0 and the manual measurement completion flag is “1”, the manual measurement means has been completed, so when the vehicle 2 passes the weighing platform 5 and Was <Wzu is established. Then, the manual measurement completion flag is reset to “0” to prepare for the weight measurement of the following vehicle.

  On the other hand, if the manual measurement completion flag is kept at “0” from the state where the axle counter Cm ≠ 0 until Was <Wzu is satisfied, it is assumed that the stop (manual) measurement means is not completed and The process (1) or (2) is performed.

  (1) When the prohibit mode in which the implementation of the automatic measuring means is prohibited is set, when the vehicle 2 gets off from the weighing platform 5, an alarm is generated by voice, display on the external display board 17, etc. , Encourage the driver to reweigh.

  (2) When the permission mode for permitting the execution of the automatic measurement means is set, the automatic measurement means is executed, the dynamic measurement value Wad generated in parallel is determined as the measurement value, and the net weight is calculated. Ask. Then, the measured value and the net weight are supplied to the memory 14 to be temporarily stored, and are output by a total weight display and a printer.

  In the present embodiment, the example in which the static measurement mode and the dynamic measurement mode are always performed in parallel has been described. However, only the static measurement mode is performed when the manual measurement unit is instructed, and the automatic measurement unit is instructed. Sometimes only the dynamic measurement mode may be implemented. Further, the weight indicator can be used for both automatic measurement and manual measurement.

  In each of the above embodiments, the IC tag, the weight measuring unit 4 and the like correspond to the switching means of the present invention.

The top view (a) and side view (b) of the vehicle weight measuring apparatus which concern on 1st Embodiment of this invention. Circuit diagram of weight measurement unit Explanatory drawing for explaining weight measurement by static measurement mode The figure which shows the waveform which sampling weight value Ws draws The figure which shows the state where dynamic measurement mode and static measurement mode were carried out in parallel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle weight measuring apparatus 2 Vehicle 2a-2c Axle 3 Weighing part 4 Weight measuring part 5 Weighing base 6a-6d Load cell 13 Processing unit 14 Memory 15 Input part 16 Display part 17 External display board 18 IC tag reader

Claims (6)

In a vehicle weight measuring device including a weighing platform on which the entire vehicle can be loaded, and a load detector disposed below the weighing platform,
When the vehicle weight measuring apparatus is in operation , a stable region is defined for the weight measurement value generated based on the output from the load detector, and the weight measurement is performed by the dynamic measurement mode for generating the weight measurement value in the stable region. and automatic measuring means for determining the value as automatic weighing, during operation of the vehicle weight measurement device, fixed as weighing the weight value measured by the static measurement mode for generating said weight measurement continuously manually Manual measurement means for performing the dynamic measurement mode and the static measurement mode in parallel without manually switching and selecting the automatic measurement means and the manual measurement means , When the stable area of the weight measurement value is within a predetermined time, the automatic measuring means is used. When the stable area of the weight measurement value exceeds the predetermined time, the manual meter is used. By means, vehicle weight measurement apparatus characterized by being configured to determine a metric value of each of the entire vehicle or axle. Weighing value generated by the dynamic measurement mode to claim 1 is an average value of the sampled weight values of the number corresponding to the length of the stabilization time region defined by detecting a change in the sampling weight values The vehicle weight measuring device as described.   2. The vehicle weight according to claim 1, wherein even if the implementation of the manual measurement unit is set, if the manual measurement unit is not implemented when the vehicle passes over the weighing platform, a re-weighing alarm signal is output. measuring device. The vehicle weight measurement device according to claim 1 , wherein an alarm is output when a time region in which the weight measurement value can be generated is equal to or less than a predetermined time length when the dynamic measurement mode is performed. Wherein even when the practice of automatic measurement means is set, the vehicle weight measurement apparatus according to claim 1, wherein the zero point adjustment by the operator based on weight measurements by the static measurement mode is possible. The vehicle weight measuring device according to any one of claims 1 to 5 , further comprising display means for instructing and displaying to a driver whether or not the vehicle is stopped on the weighing platform.

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